Role Overview

We are looking for a Senior Backend Engineer to work across our AdTech platform, including backend APIs, Real-Time Bidding (RTB) systems, and advertising reporting/data-processing services.

The engineer will work across Python, Node.js, and Java and should be comfortable owning high-volume, production-grade backend systems.

Key Responsibilities

- Design and develop backend APIs for UI and platform functionality using Python and/or Node.js.
- Build APIs supporting campaign management, configuration, reporting, and platform operations.
- Develop and maintain Java-based RTB and Ad Exchange services.
- Work on high-throughput, low-latency real-time advertising request/response processing.
- Develop and maintain Python-based advertising reporting and data-processing services/scripts.
- Work with event and reporting pipelines using technologies such as Kafka, databases, and cloud storage.
- Troubleshoot and optimize production services, database queries, and data pipelines.
- Participate in architecture, code reviews, testing, deployment, and production support.
- Collaborate with UI, SDK, DevOps, QA, and other engineering teams.

Required Skills

- Strong experience with Python and/or Node.js backend development.




- Working knowledge of Java and Scala and ability to contribute to an existing Java codebase.
- Strong experience designing and developing REST APIs.
- Strong SQL and relational database experience.
- Experience with Kafka or similar event-streaming technologies.
- Experience with distributed, scalable backend systems.
- Experience with cloud infrastructure, preferably AWS.
- Strong debugging, performance optimization, and production troubleshooting skills.
- +3 years of experience in AdTech / programmatic advertising & understanding of RTB, OpenRTB, DSPs, SSPs, Ad Exchanges, bidders, impressions, clicks, and advertising reporting.
- Experience building high-QPS, low-latency systems.
- Experience with large-scale event processing and reporting pipelines.
- Docker/containerized deployment and monitoring experience.

Experience

- - 5+ years of backend/software engineering experience preferred.
- We are looking for a strong hands-on engineer capable of independently understanding existing systems and taking ownership across API development, RTB/Ad Exchange services, and reporting/data pipelines.

📌 Senior Backend Engineer (Barcelona)
🏢 Affle
📍 Barcelona